Why Does The B26 Have So Much More Hydraulic Flow Than The BX Series?

[Soopitup]

Or maybe a better title would be, how similar is the B26 hydraulic pump to the BX series?

B26 is 24.3 HP, 11.1 GPM hydraulic flow.
BX2680 is 24.8 HP, 6.2 GPM
BX23S is 21.6 HP, 6.2 GPM.

They're all HST transmissions.

Can the BX23S handle a pump that flows almost twice as much? Or is it pretty much maxed out?
It's only 2.7 HP less than the B26.

I guess the pump is in the transmission, right? So it's probably not easily swappable.
Just thinking of ways to get more hydraulic flow to the system.

 

[lugbolt]

because it's a bigger tractor.

 

[North Idaho Wolfman]

#1 Being an HST has nothing to do with the hydraulic system, its a completely different system.
The HST does not drive the hydraulic system.
The pumps are not internal they are external.

They have completely different style of pumps
The BX is driven via the output of the transmission
The B26 is driven via the fuel cam (engine).
The BX has a very small pump
The B26 has the largest pump of all the B's.

And no you cannot make your BX run a B's pump.

 

[PaulL]

I believe the Bs have split pumps - separate for power steering and hydraulic system. The total flow is reported as the combination, but of course the power steering flow isn't available to implements.

The BX has a combined system - one pump running both. If you're not turning the wheels all the flow is available to the implements.

The B2601 claims 8.3GPM, but I think I recall about 3-4 of that is power steering, so the implement pump is actually only 4-5GPM. Which is less than the BX if you're not turning the wheels.

The reality is that these machines are generally sized to the tasks they usually do, and the flow needed to run the loader/backhoe. I'm pretty sure you'd be disappointed in changing the pump, v's just buying a B26 if you need that level of flow. It'd be pretty hard to be unhappy with a B26.

 

[TheOldHokie]

I believe the Bs have split pumps - separate for power steering and hydraulic system. The total flow is reported as the combination, but of course the power steering flow isn't available to implements.

The BX has a combined system - one pump running both. If you're not turning the wheels all the flow is available to the implements.

The B2601 claims 8.3GPM, but I think I recall about 3-4 of that is power steering, so the implement pump is actually only 4-5GPM. Which is less than the BX if you're not turning the wheels.

The reality is that these machines are generally sized to the tasks they usually do, and the flow needed to run the loader/backhoe. I'm pretty sure you'd be disappointed in changing the pump, v's just buying a B26 if you need that level of flow. It'd be pretty hard to be unhappy with a B26.

One small correction. The BX like many other models has a priority flow divider on the pump outlet. It diverts a fixed portion of the pump output to the PS circuit. That priority flow is subtracted from pump output regardless of steering activity.. The excess flow is supplied to the implement circuit.

Dan

 

[NCL4701]

You could try one of these if you can find one small enough to fit a BX23S (these folks say they’re open to customizing ) but obviously it won’t help if you’re looking for better backhoe performance. https://baumalight.com/hydraulic_power_pack/en/

Probably more seriously, if you really want/need more/better performance, the real answer is you need to trade up to a bigger machine. IF that’s where you’re at:

1. Don’t beat yourself up too bad. It’s not uncommon to buy too small and move up to the right size without putting a ton of hours on the machine. Sometime needs change and a machine that was adequate ain’t cutting it any more. That’s no one’s fault; just happens.
2. Whatever the reason, if you need a bigger machine, whether it involves adding another to the stable or selling/trading your current BX, do it if at all possible. I worked with underpowered, too small, ill equipped tractors for many years. It is a miserable experience that doesn’t improve with time.
3. I have a Toyota Tundra. It’s rated to pull 10,000lb. I like it very much. I tow with it sometimes. Pulled a 9500lb camper from central NC to Gatlinburg, TN and it did just swell. I put 10 ply truck tires on it to replace the squishy marshmallow tires that came on it. I put overload springs on the rear. I could upgrade the suspension to air bags. I could put a performance chip in it. I could do a bunch of stuff, but it’s still a Tundra. Particularly in towing, it isn’t a F-250 diesel and no amount of mods will make it one. If I develop a need to tow 16,000lb, I need another truck.
   

I understand there are economic, and possibly political, considerations to an upgrade. But the truth is if you need a performance upgrade you need to upgrade to a bigger machine.

 

[TheOldHokie]

You could try one of these if you can find one small enough to fit a BX23S (these folks say they’re open to customizing ) but obviously it won’t help if you’re looking for better backhoe performance. https://baumalight.com/hydraulic_power_pack/en/

Probably more seriously, if you really want/need more/better performance, the real answer is you need to trade up to a bigger machine. IF that’s where you’re at:

1. Don’t beat yourself up too bad. It’s not uncommon to buy too small and move up to the right size without putting a ton of hours on the machine. Sometime needs change and a machine that was adequate ain’t
2. Whatever the reason, if you need a bigger machine, whether it involves adding another to the stable or selling/trading your current BX, do it if at all possible. I worked with underpowered, too small, ill equipped tractors for many years. It is a miserable experience that doesn’t improve with time.
3. I have a Toyota Tundra. It’s rated to pull 10,000lb. I like it very much. I tow with it sometimes. Pulled a 9500lb camper from central NC to Gatlinburg, TN and it did just swell. I put 10 ply truck tires on it to replace the squishy marshmallow tires that came on it. I put overload springs on the rear. I could upgrade the suspension to air bags. I could put a performance chip in it. I could do a bunch of stuff, but it’s still a Tundra. Particularly in towing, it isn’t a F-250 diesel and no amount of mods will make it one. If I develop a need to tow 16,000lb, I need another truck.

I understand there are economic, and possibly political, considerations to an upgrade. But the truth is if you need a performance upgrade you need to upgrade to a bigger machine.

I think the OPs handle explains a lot

Dan

 

[NCL4701]

I think the OPs handle explains a lot

Dan

Good point.

 

[GreensvilleJay]

Had a Cockshut30 that had a version of that PTO pump/tank addon for the loader. It worked very.very well.
Don't know if there's room but, it's always been common to see front crankshaft driven pumps, for true 'live' hydraulics,like loaders. Also some tractors have been bodged with double pulleys on alternator to drive pumps.
If you need lots of GPM, best with a separate system as SUDT is kinda pricey, and there'd be a lot of heat to get rid of.

 

[Soopitup]

I was hoping the BX engine wasn't maxed out running the pump it has now.

It seems like the BX has enough power to run a secondary pump off the PTO if I wanted to.
Not for a loader or backhoe though, specifically for motors, like an auger.
Just food for thought for now.

I think the OPs handle explains a lot

Dan

This is very true!

 

[TheOldHokie]

I was hoping the BX engine wasn't maxed out running the pump it has now.

The OEM pump is almost zero load on the engine most of the time the tractor is running. It only becomes a significant load when a valve is operated to operate a cylinder or motor. The magnitude of that varies with the pressure and flow going to the cylinder or motor. Rule of thumb is 1 input horsepower for every gallon per minute flow at 1500 PSI. It varies linearly with pressure and flow:

2 GPM @ 1500 psi is 2 hp

2 GPM at 750 PSI is 1 hp

So in general you have full PTO horsepower available for a pump.

Dan